# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'expint.1.png'
set border 3 front lt black linewidth 1.000 dashtype solid
set key title "expint(n,x)" enhanced   center
set style data lines
set xtics border in scale 1,0.5 nomirror norotate  autojustify
set ytics border in scale 1,0.5 nomirror norotate  autojustify
set cbtics border in scale 1,0.5 nomirror norotate  autojustify
set title "Exponential Integral    {/:Italic {E_n(x) = }{/*2 ∫@_{/*0.5 1}^{/*.5 ∞}}{t^ne^{-tx}}}" 
set title  offset character 0, -3, 0 font "" textcolor lt -1 norotate
set xrange [ 0.00000 : 3.00000 ] noreverse
set yrange [ 0.00000 : 3.00000 ] noreverse
NO_ANIMATION = 1
save_encoding = "utf8"
N = 5
plot for [N=0:5] expint(N,x) with lines lw 3 title sprintf("n = %d",N)